package util;

 
 
import javax.servlet.http.Cookie;   
import javax.servlet.http.HttpServletRequest;   
import javax.servlet.http.HttpServletResponse;   
  
public class CookieUtil {   
  
    private HttpServletRequest request;   
    private HttpServletResponse response;   
    private int age;//设置cookie经过多长秒后被删除   
    public CookieUtil(HttpServletRequest request,   
            HttpServletResponse response,int age) {   
        this.request = request;          
        this.response = response;   
       this.age=age;   
    }   
       
    public void addCookie(String name, String value) {   
        Cookie cookies = new Cookie(name, value);   
        cookies.setPath("/");   
      cookies.setMaxAge(-1);//设置cookie经过多长秒后被删除。如果0，就说明立即删除。如果是负数就表明当浏览器关闭时自动删除。   
        cookies.setMaxAge(age);   
        response.addCookie(cookies);   
    }   
    public String getCookieValue(String cookieName) {   
        if (cookieName != null) {   
            Cookie cookie = getCookie(cookieName);   
            if(cookie!=null){   
            	return cookie.getValue();   
            }
            }     
        return "";   
    }   
       
    public Cookie getCookie(String cookieName){   
       Cookie[] cookies = request.getCookies();   
        Cookie cookie = null;   
       try {   
            if (cookies != null && cookies.length > 0) {   
                for (int i = 0; i < cookies.length; i++) {   
                    cookie = cookies[i];   
                   if (cookie.getName().equals(cookieName)) {   
                      return cookie;   
                   }   
                }   
            }   
        } catch (Exception e) {   
           e.printStackTrace();   
       }   
       return cookie;  
       }   
     
   public boolean deleteCookie(String cookieName) {   
        if (cookieName != null) {   
            Cookie cookie = getCookie(cookieName);   
           if(cookie!=null){   
                cookie.setMaxAge(0);//如果0，就说明立即删除   
                cookie.setPath("/");//不要漏掉   
               response.addCookie(cookie);   
               return true;   
            }   
        }   
        return false;   
    }  
}

